How can one make stable oil based ferrofluid from hydrothermally synthesized MnZn Ferrites ??

Hello, I want to make stable oil based ferrofluid from MnZn ferrite nanoparticles prepared via hydrothermal synthesis. I tried to coat it using NH4OH+Oleic acid and then added acid so as to remove...

07 August 2017 4,781 1 View

When some electrical power is driven through a wire which is wrapped around a metal tube, how to know the temp. rise of the tube theoretically??

01 February 2017 9,906 3 View

What are the experimental techniques to confirm the coating of nanoparticles?? And which one is the best to describe the situation??

I have coated a ferrite nanoparticle with an organic acid. But I want to know whether the coatings have been formed around the particles or not. What are the techniques generally used and which...

31 December 2016 8,841 10 View

What are the steps to get a smooth XRD pattern of nano sized powder samples??

How can I get a smooth XRD pattern of nano sized powder. I am using BRUKER D8 advance with a step size of 0.002 and with rotation of 15RPM with 2theta ranging between 10 deg and 90 deg. But what I...

01 January 1970 3,607 4 View

How to prepare a stable MnZn Ferrite ferrofluid using chemical methods??

I want to prepare MnZn ferrite ferrofluid. But the problem I am facing is the surface modification to avoid agglomeration of the particles. I am following the hydrothermal synthesis method for the...

01 January 1970 9,327 1 View

In COMSOL, how one can decide for the proper meshing size?

For complex research related real life problems, how can I decide that which meshing will be perfect for the problem and can rely on the final results of that for publication purpose??

01 January 1970 5,151 4 View

How to activate the surface of the nanoparticles??

I am preparing alloy nanoparticles by ball milling. But, the alloy nanoparticles have neutral surface. How can I make the surface positive or negative charged so that I can add some anionic or...

01 January 1970 4,703 5 View

How to figure out the default parameters that we can get from different modules in COMSOL and call that later for defining another function?

Hi all, I need to know the way to figure out the available by default output values from different modules which can be used in COMSOL. To make my statement clear, I am using the magnetic field no...

01 January 1970 5,091 7 View

What is the proper format of using heaviside function in COMSOL ?

I want to define heaviside function in comsol. How can I do that?

01 January 1970 5,020 2 View

How we can draw a graph between observed critical parameter versus mesh size in COMSOL? Also, how can we plot relative error versus mesh size?

To know the efficiency of the mesh size, how can we plot the error vs no. of elements/mesh size in COMSOL

01 January 1970 9,448 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Is there any tutorial for comsol general projections?

Hi, im trying to make a projection in a 3d comsol model. I have a non uniforme chanel and my intention is to get the average tempreture in the y-z cross section and se the average tempreture...

02 March 2021 4,624 4 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

Is it possible to do piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch?

How to do Piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch? Piezoelectric coupling between the rectangular substrate and rectangular...

02 March 2021 9,833 3 View

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 3 View

Do you know any MR image dataset?

I would like to research on MR images (0.5T and 3T). Can you please suggest some websites that I can download dataset including both 0.5T and 3T MR images? Thank you.

02 March 2021 7,735 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View